In message <[email protected]>, Paul Wouters writes: > On Tue, 29 Sep 2015, Florian Weimer wrote: > > > It's difficult to cause immediate mail bounces without running an MX > > host for the domain in question. Without immediate bounces, the issue > > might not be recognized in time (perhaps a bit of a stretchâbut > > immediate bounces from your own smarthost make it easier to see that > > something is really wrong). > > https://tools.ietf.org/html/rfc7505 > > A "Null MX" No Service Resource Record for Domains That Accept No Mail > > Paul
NXDOMAIN also causes a immediate bounce and doesn't send email where it isn't expected to go. That said there really is no good way to force someone to notice that they haven't paid the bill. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: [email protected]
